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Message-ID: <lhutsxxxlrl.fsf@oldenburg.str.redhat.com>
Date: Thu, 11 Dec 2025 13:09:50 +0100
From: Florian Weimer <fweimer@...hat.com>
To: Bill Roberts <bill.roberts@....com>
Cc: musl@...ts.openwall.com
Subject: Re: [RFC 03/14] aarch64: rewrite vfork routine in C using
inline asm
* Bill Roberts:
> diff --git a/src/process/aarch64/vfork.c b/src/process/aarch64/vfork.c
> new file mode 100644
> index 00000000..87ec8ebf
> --- /dev/null
> +++ b/src/process/aarch64/vfork.c
> @@ -0,0 +1,21 @@
> +#include <sys/types.h>
> +
> +#include "syscall.h"
> +
> +pid_t vfork(void)
> +{
> + /* aarch64 Linux syscall: x8 = nr, x0..x5 = args, ret in x0 */
> + register long x8 __asm__("x8") = 220; /* SYS_clone */
> + register long x0 __asm__("x0") = 0x4111; /* SIGCHLD | CLONE_VM | CLONE_VFORK */
> + register long x1 __asm__("x1") = 0; /* arg2 = 0 */
> +
> + __asm__ volatile (
> + "svc 0\n\t"
> + ".hidden __syscall_ret\n\t"
> + "b __syscall_ret\n\t"
> + : "+r"(x0) /* x0 = in/out */
> + : "r"(x1), "r"(x8) /* inputs */
> + : "memory", "cc"
> + );
> + __builtin_unreachable();
> +}
This is incompatible with building with -fstack-protector-all, isn't it?
Thanks,
Florian
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